These checkers are versatile and can be used with both factory-loaded and reloaded ammunition. This flexibility allows users to confirm that their ammunition complies with specifications before heading to the range or field. By verifying the ammunition's compatibility, shooters can avoid potential issues that could disrupt their shooting experience. Our case gauge ammo checkers are precision-engineered from solid 6061-T6 aircraft-grade aluminum, ensuring superior durability and performance in demanding environments Our precision-engineered gauges are meticulously crafted to adhere to the SAAMI minimum specifications, ensuring optimal compatibility and performance across a wide range of applications While certain manufacturers employ standard boring bars for chamber checker production, we utilize authentic Clymer reamers, identical to those used in precision barrel chambering processes Anodized matte black finish for enhanced durability Determines the minimum diameter specification of the case Determines the maximum permissible overall length specification